Connecting The Pots Splitter; Telephone Microfilters - ZyXEL Communications Prestige 642 User Manual

Flow Control set to None
After the Prestige has been successfully connected to your network, you can make future changes to the
configuration via telnet.
2.4

Connecting the POTS Splitter

This is for P642's following the Full Rate (G.dmt) standard only. One major difference between ADSL and
dial-up modems is the need for a telephone splitter. This device keeps the telephone and ADSL signals
separated, giving it the capability to provide simultaneous Internet access and telephone service on the same
line. Splitters also eliminate the destructive interference conditions caused by telephone sets. The telephone
splitter has to be installed on the line at the point of entry to the residence.
Noise generated from a telephone in the same frequency range as the ADSL signal can be disruptive to the
ADSL signal. In addition the impedance of a telephone when off-hook may be so low that it essentially
shunts the strength of the ADSL signal. When a POTS splitter is installed at the entry point where the line
comes into the home, it will filter the telephone signals before combining the ADSL and telephone signals
transmitted and received. The issues of noise and impedance are eliminated with a single POTS splitter
installation.
The following user-friendly telephone splitter can be installed as shown in the following figure.
Wall
Jack
Step 1. Connect the side labeled "Phone" to your telephone.
Step 2. Connect the side labeled "Modem" to your Prestige.
Step 3. Connect the side labeled "Line" to the telephone wall jack.
2.5

Telephone Microfilters

Telephone voice transmissions take place in the lower frequency range, 0 - 4KHz, while ADSL
transmissions take place in the higher bandwidth range, above 4KHz. ZyXEL provides a microfilter that
acts as a low-pass filter for your telephone to ensure that ADSL transmissions do not interfere with your
telephone voice transmissions.
Hardware Installation & Setup
Prestige
Modem
POTS Splitter
Line
Figure 2-3 Connecting a POTS Splitter
Prestige 642 ADSL Internet Access Router
Phone
2-3